Malicious PDF — malware analysis report

Static analysis result for SHA-256 2593d4d78181d702…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 17:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a0fc5cb71ec274f4e86fed9a256cb390 SHA-1: 8dad6b530768ecb580e6f126049760b88872893a SHA-256: 2593d4d78181d70239fe430434f006b05f8793219e6fc9f5905ebc4a6b95d4fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links pointing to disposable hosting, suggesting a link farm used for phishing or distributing further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://3e3i.com/UserFiles/file///41249753577.pdf In PDF document text
    • http://ave-france.com/pics/files/nexiwitime.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/66737360818.pdfIn PDF document text
    • http://kodemari.info/data/files/liwejodo.pdfIn PDF document text
    • http://air-ned.com/uploads/files/timematuzuxek.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/90410950899.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/16835865601.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5rl8678h4i4lrb9fld6a3n2von/46961156983.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/19393238412.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/45924211846.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/78906617593.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/59609635172.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/77315905140.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zasejodimejakujosiwo.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/52397533459.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/zasosuvapewosegiwe.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/gikaxagapifevudim.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sobixi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330149395a5---modemur.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/xuxikasapadusugozi.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/71802077776.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/varumojifepole.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/71503101991.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/13239247447.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/rikubuxovolikadokirupekod.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tefesazebibejozitumo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/35863684051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redeem+psn+code+ps5PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 15868 bytes
SHA-256: 367e3ba08dc8d9d12efd1da4cbb616253a2d090d7b2d523af592e0f3c6c98514
font_01_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 10356 bytes
SHA-256: d2e3a1b9a7b8df9b953922e816b34f95f4dd21c6c7352ae2537d8753d7fbd097
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1